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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques | The following table presents the significant estimates used by management in determining the fair values of customer relationships associated with acquisitions in the six months ended June 30, 2018 and year ended December 31, 2017:
|  | 2018 |  | 2017
Discount rates |  | 25% |  | 17% to 25%
Customer attrition rates |  | 20% |  | 15% to 78%
Disaggregation of Revenue | The following tables present Quanta’s revenue disaggregated by geographic location and contract type for the three and six months ended June 30, 2018 (in thousands):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, 2018 |  | June 30, 2018
By primary geographic location: |  |  |  |
United States |  | $ | 2,193,437 |  |  | $ | 3,905,864 |
Canada |  | 315,173 |  |  | 853,531 |
Australia |  | 113,880 |  |  | 233,337 |
Latin America and Other |  | 33,858 |  |  | 81,192 |
Total revenues |  | $ | 2,656,348 |  |  | $ | 5,073,924 |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, 2018 |  | June 30, 2018
By contract type: |  |  |  |
Unit-price contracts |  | $ | 1,018,145 |  |  | $ | 1,631,583 |
Fixed price contracts |  | 1,032,991 |  |  | 2,258,080 |
Cost-plus contracts |  | 605,212 |  |  | 1,184,261 |
Total revenues |  | $ | 2,656,348 |  |  | $ | 5,073,924 |
Contract with Customer, Asset and Liability | Contract assets and liabilities consisted of the following (in thousands):
|  | June 30, 2018 |  | December 31, 2017
Contract assets |  | $ | 551,505 |  |  | $ | 497,292 |
Contract liabilities |  | $ | 496,083 |  |  | $ | 433,387 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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